question_answer

The order of stability of the following carbocations:  

(I) \[C{{H}_{2}}=CH-\overset{+}{\mathop{C}}\,{{H}_{2}}\]

(II) \[C{{H}_{3}}-C{{H}_{2}}-\overset{+}{\mathop{C}}\,{{H}_{2}}\]

(III)

(IV) \[\overset{+}{\mathop{C}}\,{{H}_{3}}\] is:

A) IV > III > II > I      

B) II > III > I > IV

C) III > I> II > IV      

D) III > I > IV > II

Correct Answer: C

Solution :

[c] Higher stability of allyl and aryl substituted methyl carbocation is due to dispersal of positive charge due to resonance Resonating structure of benzyl carbocation Hence the correct order of stability will be